How to Dial Other Countries in the North American Numbering Plan

To make an international telephone call to any country that's part of the North American Numbering Plan (NANP), please follow the dialing procedure shown below.

NANP is an integrated telephone numbering scheme that has been adopted by 19 countries in North America and the Caribbean. All countries who participate in NANP utilize the same telephone numbering formats.

The inbound international dialing procedure to reach any NANP country is the same. However, your dialing procedure may be affected if you are calling using a calling card or VoIP phone service.

All NANP countries utilize the same phone number format for both landline and mobile phones.

Because all NANP countries use the same country code, the NANP numbering scheme differentiates specific locations - whether a country like Jamaica, or a city like Los Angeles, by using distinct area codes.

To make an international phone call to a NANP country, you need to dial a phone number formatted as follows:

US Territories in NANP

Dialing Tips

If you are in an office or building with a main switchboard or PBX, make sure you have a live outside line by dialing '9' or similar

Some mobile carriers provide shortcuts for making international calls - generally, by changing if or how an IDD is dialed. E.g., In the US, t-mobile allows you to dial a '+' instead of an IDD when calling international numbers.